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Patient Care Alliance of LA filed a lawsuit attempting to put an injunction on the city’s so-called gentle ban, which would close dispensaries but allow homegrown marijuana. One patient, who wanted to be identified only by her first name, Jennifer, says the ban focuses on the wrong enemy, pointing to phony doctors rather than dispensaries as the problem. The new lawsuit hopes to prevent the shutdown slated to go into effect in weeks. John Cadiz Klemack reports for the NBC4 News at 5 p.m. on Aug. 17, 2012. (Published Friday, Aug 17, 2012)

Updated at 10:16 PM PST on Friday, Aug 17, 2012

A medical marijuana trade group sued the city of Los Angeles Friday, seeking to stop officials from enforcing a new ban designed to shut down more than 1,000 pot dispensaries.

The Patient Care Alliance, Los Angeles, or PCA-LA, announced that it filed a lawsuit Friday seeking an injunction against a controversial ordinance approved by the City Council last month that supporters said was needed to grapple with the proliferation of marijuana dispensaries.

Investigation: Who's Really Writing Pot Prescriptions?

Some Southern California doctors are signing prescriptions for medical marijuana without ever examining or even meeting the patients, an NBC4 I-Team investigation has found. Authorities say this practice is clearly against the law, but it is providing a steady stream of customers for the pot shops. Joel Grover reports for NBC4 News at 12 a.m. on August 11, 2012. (Published Saturday, Aug 11, 2012)

"The City Council's actions are not only reckless, heartless and pointless, they're just plain stupid," said Marc O'Hara of PCA-LA. "The city knows that it will never be able to successfully defend this lawsuit."

It comes the same week that the city sent out letters to 1,046 locations where medical marijuana dispensaries are thought to be operating, according to the office of City Attorney Carmen Trutanich. The letter — sent to 1,774 business and property owners, according to the city — is cited in the lawsuit.

Advocates Vow to Fight LA's Medical Marijuana Dispensary Ban

Medical marijuana patients say they are frustrated by the LA City Council's decision to ban storefront dispensaries and are vowing to fight the ban in court and on the ballot. Conan Nolan reports from Studio City for the NBC4 News at 5 p.m. on July 25, 2012. (Published Wednesday, Jul 25, 2012)

The letter (PDF), mailed Tuesday, instructs business owners that a new ordinance making their operations illegal becomes effective Sept. 6.

The new city ordinance (PDF) affects any "medical marijuana business," which is defined as "Any location where marijuana is cultivated, processed, distributed, delivered or given away to a qualified patient, a person with an identification card, or a primary caregiver," the letter states.

"Continuance of a medical marijuana business at this location may subject you to legal action resulting in a court ordered closure and imposition of monetary penalties of $2,500 a day, as well as prosecution for a misdemeanor, punishable by six months in jail and a $1,000.00 fine," the letter states. "Each day that the property is used in violation of City law is a separate violation."

The City Attorney's Office said in a statement that the letter "is not part of any enforcement scheme," noting it advises business owners to consult with their attorneys.

Medical marijuana advocates also vowed to put a referendum on the ballot asking voters to halt enforcement of the ban until a forthcoming California Supreme Court decision is issued clarifying pot-shop regulation. Many dispensaries in the city have in recent weeks been gathering signatures for the ballot measure.

When the ordinance passed, city officials said Los Angeles had 762 registered dispensaries. The list of 1,046 locations that received letters this week were compiled from several sources, the City Attorney's Office said, adding that the locations had not been verified.

At the same time it approved its ban, the council also passed a measure asking city attorneys to study and draw up plans to allow 182 pot shops — ones that registered with the city under a 2007 ordinance attempting to regulate the dispensaries — to continue to operate. That seeminlgy contradictory move could take months to realize.

Friday's lawsuit (PDF) was filed on behalf of 11 patients who have been prescribed medical marijuana for serious medical conditions, according to the complaint.

It states that the city's ordinance is in conflict with California's 1996 law legalizing the medical use of marijuana – legislation that was passed by voters through Proposition 215.

Supporters of the city's pot-shop ban say that voters who approved of medical marijuana use never envisioned the development of a multi-billion-dollar industry in the state, nor the explosive growth of dispensaries and pot-focused medical clinics.

The lawsuit argues that the city ordinance is unconstitutional and denies business owners due process.

The City Attorney's Office said it had no comment on the suit.

City Councilman Jose Huizar, who pushed for the city's dispensary ban, noted in a statement that the ordinance allows small collectives of qualified patients to grow their own marijuana. He said he felt confident that the court would side with Los Angeles.